Miles,

If you want a low RDSon, shouldn't you use an N channel device?
And I have had no problems driving a FET if I use a pullup resistor,
(or pulldown if that's what I need).

                                                            Regards,

                                                                Jim
----- Original Message -----
From: Miles McKinnon <miles.piclist@HOME.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, June 28, 2001 3:27 PM
Subject: [EE]: Modulating a headlight


> I am building a motorcycle headlight modulator using a PIC to monitor
> ambient light and a few other things.  Anyway, the PIC has to modulate the
> headlight ( ~ 4Amps) at a arount 240Hz or so.
>
> There are a few legal stipulations.  They say that you cannot switch the
> ground, you must switch the +12V to the headlight.  I want to use a low
Rds
> HEXFET or simular transistor, but I think I would need a P-Channel device.
>
> Is a P-Channel Mosfet difficult to drive from a TTL logic level, such as a
> PIC.
>
> Thanks for any help.
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.
>
>
>

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